안드로이드 스튜디오 import java.lang.reflect.Array; 질문이요

Question

<MainActivity.java>

package com.example.park.xy;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;

import com.androidplot.series.XYSeries;
import com.androidplot.xy.LineAndPointFormatter;
import com.androidplot.xy.SimpleXYSeries;
import com.androidplot.xy.XYPlot;
import java.lang.reflect.Array;
import java.util.Arrays;

public class MainActivity extends Activity {

    String [] months = new String[]{"A","B","C","D","E","F","G","H"};
    Number[] incomes={2000, 2500, 2700, 3000, 2800, 3500, 3700, 3800};
    Number[] expences={2200, 2700, 2900, 2800, 2600, 3000, 3300, 3400};

    XYPlot xyplot;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        xyplot=(XYPlot)findViewById(R.id.plotxy);

        XYSeries incomePlot=new SimpleXYSeries(Arrays.asList(incomes), SimpleXYSeries.ArrayFormat.Y_VALS_ONLY,"Income");

        XYSeries expence=new SimpleXYSeries(Arrays.asList(expences), SimpleXYSeries.ArrayFormat.Y_VALS_ONLY,"Expence");

        LineAndPointFormatter IncomeFormatter=new LineAndPointFormatter(
                Color.rgb(255,0,0),
                Color.rgb(0,255,0),
                null);


        LineAndPointFormatter ExpenceFormatter=new LineAndPointFormatter(
                Color.rgb(255,0,0),
                Color.rgb(0,255,0),
                null);
    }
/*
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
*/
}

안드로이드 스튜디오인데 저런식으로 흰색으로 변하면서 안먹히네요....

import java.lang.reflect.Array; 부분도 흰색이라 스샷에는 안찍혔어용

꺾은선 그래프 만들고 있는데 저부분 인식이 안되서 그래프가 안나타나요...

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